I have bookmarked the site.

I'm assuming you're referring to the area in this link:
(link...)

But the simple matter is that the KGIS plainimetric basemap (from which the thick grey lines are derived ) is out of date. (still 2003 vintage)...while this area was last mapped (via photogrammetric means) in 2010, we've only now recieved the final approved version from our vendor, and plan to incorporate that "new" map into KGIS Maps over the next month. You''ll notice that the aerial map is more up to date (2010).

And if you look closely, you might notice that there are also some thin grey lines on the map which are the schematics drawn in by MPC as part of their street naming workflows....MPC does a great job of digitizing in the "centerlines" from subdivision plats, etc. These lines represent the more current flow of the roads, and the street name labels will follow these centerlines. Eventually the underlying basemap will be updated to match with these.

That being said, we may be able to adjust the cartography on our maps to emphasize the MPC lines a little better. Sorry for the long, and belated, answer, but it's kind of hard to explain in a short manner.

Take care, Keith